APA (7th ed.) Citation

Gruber, M. (1976). Drei Portraits Joseph Effners.

Chicago Style (17th ed.) Citation

Gruber, Max. Drei Portraits Joseph Effners. 1976.

MLA (9th ed.) Citation

Gruber, Max. Drei Portraits Joseph Effners. 1976.

Warning: These citations may not always be 100% accurate.